| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 42m 11.49887s[1] |
| Declination | +19° 16′ 37.2375″[1] |
| Apparent magnitude (V) | 12.143[2] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | K1V[2] or late G[3] |
| Apparent magnitude (G) | 11.926±0.003[1] |
| Apparent magnitude (J) | 10.660±0.022[2] |
| Apparent magnitude (H) | 10.242±0.019[2] |
| Apparent magnitude (K) | 10.173±0.016[2] |
| Astrometry | |
| Radial velocity (Rv) | 35.37±0.42[1] km/s |
| Proper motion (μ) | RA: -36.820 mas/yr[1] Dec.: -12.384 mas/yr[1] |
| Parallax (π) | 5.4387 ± 0.0184 mas[1] |
| Distance | 600 ± 2 ly (183.9 ± 0.6 pc) |
| Details[4] | |
| Mass | 0.935±0.013 M☉ |
| Radius | 0.827±0.012 R☉ |
| Surface gravity (log g) | 4.51±0.05 cgs |
| Temperature | 5300±30 K |
| Metallicity [Fe/H] | 0.18±0.02 dex |
| Rotation | 7.97 days[5] |
| Rotational velocity (v sin i) | 5.1±0.3 km/s |
| Age | 578±12 or 790±30 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Pr0211 (sometimes written Pr 0211, also 2MASS J08421149+1916373) is a Sun-like late G or early K-type main-sequence star in the Beehive Cluster, or Praesepe, located 600 light-years away in the constellation Cancer. It is rotationally variable and has a rotation period of 7.97 days,[5] with its spin axis at an inclination of 76°±11° to the plane of the sky.[4] Pr0211 hosts two known exoplanets, and was the first multi-planet system to be discovered in an open cluster.[3][4]
Pr0211 forms a binary star system with a K-type main-sequence star known as NGC 2632 JC 280 or 2MASS J08421285+1916040.[6][7][8]
Planetary system[edit]
Pr0211 b is a gas giant exoplanet, specifically a hot Jupiter, orbiting around Pr0211. Pr0211 b along with Pr0201 b are notable for being the first exoplanets discovered in the Beehive Cluster.[9][10] Pr0211 b and Pr0201 b were discovered in 2012 by Sam Quinn[9][10][3] and his colleagues while observing 53 stars in the Beehive Cluster using the 1.5 metres (4.9 ft; 1.6 yd) telescope at the University of Georgia in the United States.[9]
Pr0211 c is a gas giant exoplanet orbiting around Pr0211.[11] Pr0211 c was discovered in 2016 by Luca Malavolta[11][4] and his colleagues while observing its host star with the HARPS-N spectrograph on the 3.6 metres (12 ft; 3.9 yd) Italian Telescopio Nazionale Galileo (TNG) in La Palma, and the Tillinghast Reflector Echelle Spectrograph (TRES) mounted at the 1.5 metres (4.9 ft; 1.6 yd) telescope at the University of Georgia in the United States.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥1.88±0.03 MJ | 0.03176±0.00015 | 2.14610±0.00003 | 0.011+0.012 −0.008 |
— | — |
| c | ≥7.79±0.33 MJ | 5.5+3.0 −1.4 |
4850+4560 −1750 |
0.71±0.11 | — | — |
References[edit]
- ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b c d e f "Cl* NGC 2632 JC 278". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 December 2023.
- ^ a b c Quinn, Samuel N.; White, Russel J.; Latham, David W.; Buchhave, Lars A.; Cantrell, Justin R.; Dahm, Scott E.; Fűrész, Gabor; Szentgyorgyi, Andrew H.; Geary, John C.; Torres, Guillermo; Bieryla, Allyson; Berlind, Perry; Calkins, Michael C.; Esquerdo, Gilbert A.; Stefanik, Robert P. (2012). "Two 'b's in the Beehive: The Discovery of the First Hot Jupiters in an Open Cluster". The Astrophysical Journal. 756 (2): L33. arXiv:1207.0818. Bibcode:2012ApJ...756L..33Q. doi:10.1088/2041-8205/756/2/L33. S2CID 118825401.
- ^ a b c d e Malavolta, L.; et al. (2016), "The GAPS programme with HARPS-N at TNG. XI. Pr 0211 in M 44: the first multi-planet system in an open cluster", Astronomy & Astrophysics, 588: A118, arXiv:1602.00009, Bibcode:2016A&A...588A.118M, doi:10.1051/0004-6361/201527933, S2CID 119207951
- ^ a b Kovács, Géza; Hartman, Joel D.; Bakos, Gáspár Á.; Quinn, Samuel N.; Penev, Kaloyan; Latham, David W.; Bhatti, Waqas; Csubry, Zoltán; De Val-Borro, Miguel (2014). "Stellar rotational periods in the planet hosting open cluster Praesepe". Monthly Notices of the Royal Astronomical Society. 442 (3): 2081. arXiv:1405.3728. Bibcode:2014MNRAS.442.2081K. doi:10.1093/mnras/stu946.
- ^ Mugrauer, M. (December 2019). "Search for stellar companions of exoplanet host stars by exploring the second ESA-Gaia data release". Monthly Notices of the Royal Astronomical Society. 490 (4): 5088–5102. Bibcode:2019MNRAS.490.5088M. doi:10.1093/mnras/stz2673.
- ^ "Pr0211". NASA Exoplanet Archive. Retrieved 9 December 2023.
- ^ "Cl* NGC 2632 JC 280". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 9 December 2023.
- ^ a b c Fazekas, Andrew (2012-09-21). "New Planets Found in Star Cluster - Would Have Dazzling Nights". National Geographic News. NATIONAL GEOGRAPHIC. Archived from the original on September 23, 2012. Retrieved 2016-05-30.
- ^ a b "Planet Pr 0211 b". Extrasolar Planets Encyclopaedia. Retrieved 2016-04-18.
- ^ a b "Planet Pr 0211 c". Extrasolar Planets Encyclopaedia. Retrieved 2016-04-18.
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